is CD (continues deployment) a good idea?

If you are only required to release once every few weeks and you are fully ready then you're still doing continuous delivery. It's a good idea because the aim is to remove software delivery as a bottleneck to realised business value, which it frequently is.

There is a lot of infrastructure and culture needed to be successful with CD. I've read culture is important in the past, now I see why. There is a need to dig deep and not skip digging deep to both fix product but also the infrastructure.

Yes